diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2015-12-04 23:49:24 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-01-07 14:11:54 +0100 |
| commit | 02a21b79acdb48b312f1351fd7cc728e66e81149 (patch) | |
| tree | 3af9afe12232ea84f6fe7903854779c223243791 /drivers/dma | |
| parent | 3214658855c01a0dd62f02feb2ce79846524c6a0 (diff) | |
| download | linux-02a21b79acdb48b312f1351fd7cc728e66e81149.tar.bz2 | |
dmaengine: dw: return immediately from IRQ when DMA isn't in use
There is no need to bother the hardware when all channels are idle. We have not
to get any interrupts.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/dw/core.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c index 7067b6ddc1db..8b20930ade98 100644 --- a/drivers/dma/dw/core.c +++ b/drivers/dma/dw/core.c @@ -622,12 +622,17 @@ static void dw_dma_tasklet(unsigned long data) static irqreturn_t dw_dma_interrupt(int irq, void *dev_id) { struct dw_dma *dw = dev_id; - u32 status = dma_readl(dw, STATUS_INT); + u32 status; + /* Check if we have any interrupt from the DMAC which is not in use */ + if (!dw->in_use) + return IRQ_NONE; + + status = dma_readl(dw, STATUS_INT); dev_vdbg(dw->dma.dev, "%s: status=0x%x\n", __func__, status); /* Check if we have any interrupt from the DMAC */ - if (!status || !dw->in_use) + if (!status) return IRQ_NONE; /* |